What is the best way to handle an AJAX JSON response in AngularJS?

Question

What is the best way to handle an AJAX JSON response in AngularJS?

Need help with extracting properties from a JSON object returned by a REST service in AngularJS? Want to parse the firstName, lastName, and other attributes from the JSON response? Check out the code snippets below for guidance.

Here is an example of an AngularJS controller that makes a call to a Spring Boot back end REST service:

angular.module('confirm', []).controller('confirm', function($scope, $http, $routeParams) {

     // set the default value
    $scope.confirmStatus = "blank";

    $scope.$on('$viewContentLoaded', function() {

        var str1 = "/confirm-email?d=";
        var str2 = $routeParams.d;
        var res = str1.concat(str2);
        var fnm3 = "nothing";
        
        $http.post(res).then(function(response) {
            fnm3 = response.data.firstname;//this line halts the program
            //replacing with following line doesn't work.
            //$scope.weblead = response.data;
        });
        
        $scope.confirmStatus = "success";
        document.write(fnm3);
    });
});

And here is a snippet of the Spring Boot method responsible for delivering the JSON response:

@RequestMapping(value = "/confirm-email", method = RequestMethod.POST)
public @ResponseBody WebLead confirmEmail(HttpSession session, @RequestParam(value="d") String dval) {
    WebLead dummy = new WebLead();dummy.setFirstname("justAtest");
    
    try{
        System.out.println("The Server Heard The registration form Request!");
        System.out.println("dval is: "+dval);       
        String sid = session.getId();
        System.out.println("session id is: "+sid);
        
        try{
            List<WebLead> wleads = myrepo.findBySessionid(dval);
            
            if(wleads.size()>0){//replace with better handling later
                System.out.println("wleads.size is > 0 !");
                wleads.get(0).setEmailConfirmed("true");
                myrepo.save(wleads.get(0));
                return myrepo.findBySessionid(dval).get(0);
            }
            
            return dummy;
            
        } catch(Exception e){
            return dummy;
        }
        
    } catch(Exception e){
        return dummy;
    }
}

Please Note: In the logs starting with the System.out.println messages within the /confirm-email handler, you can see that the post request was successfully processed on the server side.

The Server Heard The registration form Request!
dval is: a1b2c3
session id is: E1F844262F254E9B0525504723DBA490
2016-01-07 12:11:49.773 DEBUG 7288 --- [nio-9000-exec-9] w.c.HttpSessionSecurityContextRepository : SecurityContext is empty or contents are anonymous - context will not be stored in HttpSession.
2016-01-07 12:11:49.774 DEBUG 7288 --- [nio-9000-exec-9] tRepository$SaveToSessionResponseWrapper : Skip invoking on
2016-01-07 12:11:49.774 DEBUG 7288 --- [nio-9000-exec-9] tRepository$SaveToSessionResponseWrapper : Skip invoking on
2016-01-07 12:11:49.774 DEBUG 7288 --- [nio-9000-exec-9] o.s.s.w.a.ExceptionTranslationFilter     : Chain processed normally
2016-01-07 12:11:49.774 DEBUG 7288 --- [nio-9000-exec-9] s.s.w.c.SecurityContextPersistenceFilter : SecurityContextHolder now cleared, as request processing completed

javascript angularjs json ajax spring

Answer 1

Answer №1

To extract data from a JSON string, you can utilize the JSON.parse(jsonData) method. The following code snippet outlines how this can be achieved:

$http.post(res).then(function(response) {
    $scope.data = JSON.parse(response.data);
    fnm3 = $scope.data.firstname;
});

During my work with the REST service, I often incorporate console logs within functions for debugging purposes. These logs act as a helpful tool to monitor the data returned by the service.

$http.post(res).then(function(response) {
    console.log(response);
});

Answer 2

To extract data from a JSON string, you can utilize the JSON.parse(jsonData) method. The following code snippet outlines how this can be achieved:

$http.post(res).then(function(response) {
    $scope.data = JSON.parse(response.data);
    fnm3 = $scope.data.firstname;
});

During my work with the REST service, I often incorporate console logs within functions for debugging purposes. These logs act as a helpful tool to monitor the data returned by the service.

$http.post(res).then(function(response) {
    console.log(response);
});

Answer 3

Answer №2

My recommendation is to avoid manually building strings with parameters for requests in Angular. Instead, you can simplify the process by using the following code:

$http({
    method: 'POST',
    url: '/confirm-email',
    headers: {
        'Content-Type': 'application/json'
    },
    params: {
        d: $routeParams.d
    }
}).then(function(response) {
    ...
});

By setting the content-type header to "application/json", Angular will automatically parse your data if the server supports it and return a JavaScript object as response.data.

The issue of not displaying the data in your code arises because the POST call is asynchronous, while the document.write function prints the variable immediately after sending the request.

To address this, there are two solutions:

(Quick but not recommended) Use a second document.write within the post-request callback function.
(The proper approach) Assign the value to an Angular scope variable:

$scope.fnm3 = response.data.firstname;

You can then use a corresponding template for angular two-way-binding like:

Firstname: {{ fnm3 }}

Answer 4

My recommendation is to avoid manually building strings with parameters for requests in Angular. Instead, you can simplify the process by using the following code:

$http({
    method: 'POST',
    url: '/confirm-email',
    headers: {
        'Content-Type': 'application/json'
    },
    params: {
        d: $routeParams.d
    }
}).then(function(response) {
    ...
});

By setting the content-type header to "application/json", Angular will automatically parse your data if the server supports it and return a JavaScript object as response.data.

The issue of not displaying the data in your code arises because the POST call is asynchronous, while the document.write function prints the variable immediately after sending the request.

To address this, there are two solutions:

(Quick but not recommended) Use a second document.write within the post-request callback function.
(The proper approach) Assign the value to an Angular scope variable:

$scope.fnm3 = response.data.firstname;

You can then use a corresponding template for angular two-way-binding like:

Firstname: {{ fnm3 }}

Answer 5

Answer №3

To enhance efficiency and reduce the amount of code written, as well as promote reusability when calling services across multiple pages, utilize the following code snippet:

App.service("metaService", function ($http,$cookies) {  

    this.CallService = function (verb, serviceName, Data) {

    var Url = BaseURL + serviceName;

    switch (verb) {

        case "get":
            {
                return $http({
                    method: verb,
                    url: Url
                    , headers: {
                        'Content-Type': 'application/json; charset=UTF-8',
                        'Accept': '*/*',
                    }
                });
                break;
            }
        case "post":
        case "put":
        case "delete":
            {
                return $http({
                    method: verb,
                    url: Url,
                    data: Data
                   , headers: {
                       'Content-Type': 'application/json; charset=UTF-8',
                       'Accept': '*/*',
                   }
                });
                break;
            }
    }
}

});

Subsequently, you can invoke the callservice method in the following manner:

 var SearchData = metaService.CallService1(method, "meta/selectAll", searchedMeta);
          SearchData.success(function (data) {

    $scope.Title = data.Title
}

Answer 6

To enhance efficiency and reduce the amount of code written, as well as promote reusability when calling services across multiple pages, utilize the following code snippet:

App.service("metaService", function ($http,$cookies) {  

    this.CallService = function (verb, serviceName, Data) {

    var Url = BaseURL + serviceName;

    switch (verb) {

        case "get":
            {
                return $http({
                    method: verb,
                    url: Url
                    , headers: {
                        'Content-Type': 'application/json; charset=UTF-8',
                        'Accept': '*/*',
                    }
                });
                break;
            }
        case "post":
        case "put":
        case "delete":
            {
                return $http({
                    method: verb,
                    url: Url,
                    data: Data
                   , headers: {
                       'Content-Type': 'application/json; charset=UTF-8',
                       'Accept': '*/*',
                   }
                });
                break;
            }
    }
}

});

Subsequently, you can invoke the callservice method in the following manner:

 var SearchData = metaService.CallService1(method, "meta/selectAll", searchedMeta);
          SearchData.success(function (data) {

    $scope.Title = data.Title
}

What is the best way to handle an AJAX JSON response in AngularJS?

Answer №1

Answer №2

Answer №3

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